> From: David Carlisle [SMTP:davidc@nag.co.uk]
>
> external references that are needed to have `all necessary information'
> about XML, and the SGML spec is _not_ one of them.
>
It couldn't be simple and relatively self contained
if it included the SGML standard by reference. Also,
given that the SGML standard is a paid for document,
the proportion of people using it without having read
the standard would be even greater than is likely to
be the case with the current specification.